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Reply to "I'm baaaaack!"

Safety Jim Buffalo NY. posted:

Caution, thread drift ahead! 

     I pulled the heads of my new motor and did a measurement of the cylinder spigot going into the head. (97.77mm)  Then, the bore into the head. (98.14 & 98.17mm)  I believe, .40 gap is the reason for rapid leakdown of very low compression after only 20 total minutes of run time. 

   Any thoughts from the motor experts.  This is the only mild performance build I have done. I normally go with stock 1600 motors.... This one has been a bug in my butt since the get go! 

Are you sure there's not something else going on? Head bores are always cut slightly larger (any where from .010- .020") than the cylinders; yours do seem a little excessive, but as long as the barrel tops are on the same plane and and the head surfaces are flat I wouldn't think the head bore being a little large would cause what you're experiencing. 

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